Bushmaster Preadator 556 Jamming

Hello,
I'm new to the forum and hope someone can help me. I just purchased a new Bushmaster Preadator and I'm experiencing jamming issues when trying to shoot 556 through it. The lower is stamped 223/556 and will shoot 223 through it all day with no problem. However, when I try and shoot 556 it jams every time on the 2nd-3rd round. I have used PMC 55 grain JHP 223 up to 77 grain JHP 223 with no problem. The 556 I used was 55 grain American Eagle and Winchester FMJ and both jam. Any help/advice would be greatly appreciated.
Thanks, Rob.

I have a predator that did the same thing. I pulled the buffer rod and spring cleaned the tube out really well oiled the spring up and reassembled it shoots fine now I think it may be just some crud build up an lack of lubricant. hope this helps

I'm having a failure to feed issue. I'm using Magpul mags and the weapon is very clean and well lubed. Like I said it will gobble up 223 ammo all day with no issues so I'm not sure why 556 is such a problem.
Thanks to all for the quick replys.
Rob.

I have a predator that did the same thing. I pulled the buffer rod and spring cleaned the tube out really well oiled the spring up and reassembled it shoots fine now I think it may be just some crud build up an lack of lubricant. hope this helps

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Make sure that the bolt is well lubricated in the bolt carrier as well. Most new ARs of any brand that I've seen come way to dry. A dry bolt can make the spent round not eject correctly and cause feed jams on the next round.

What lube would you suggest? I've been using CLP/Break Free,etc. I just ordered some Slip 2000 and will give that a try. I've heard that automatic transmission fluid work great on bolt carriers too???
Thanks again for the help everyone...
Rob.

What lube would you suggest? I've been using CLP/Break Free,etc. I just ordered some Slip 2000 and will give that a try. I've heard that automatic transmission fluid work great on bolt carriers too???
Thanks again for the help everyone...
Rob.

Click to expand...

CLP is what they used when I was in the military. I still use it on my weapons. It should be all you need to keep er lubed up right.

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